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catalyst

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catalyst in WordNet English dictionary

noun
  1. (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected
    catalyst  accelerator 
  2. something that causes an important event to happen
    "the invasion acted as a catalyst to unite the country"
    catalyst 
WordNet Lexical Database v3.0, © 2006 Princeton University


catalyst in English Wiktionary

 
  1. (noun) (chemistry) A substance which increases the rate of a chemical reaction without being consumed in the process.
  2. (noun) (automotive) A catalytic converter.
  3. (noun) Someone or something that helps or encourages progress or change.
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